Nuclear Engineering and Technology
- Volume 27 Issue 1
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- Pages.96-104
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- 1995
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- 1738-5733(pISSN)
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- 2234-358X(eISSN)
Reactor Power Cutback Feasibility to a 12-Finger CEA Drop to Avoid Reactor Trips
- Auh, Geun-Sun (Korea Atomic Energy Research Institute) ;
- Yoo, Hyung-Keun (Korea Atomic Energy Research Institute) ;
- Lim, Chae-Joon (Korea Atomic Energy Research Institute) ;
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Kim, Hee-Cheol
(Korea Atomic Energy Research Institute) ;
- Lee, Sang-Keun (Korea Atomic Energy Research Institute)
- Published : 1995.02.01
Abstract
EPRI URD requires that the reactor be capable of accommodating an unintended CEA drop without initiating a trip and operating at a reduced power with ay single CEA fully inserted. YGN 3 and 4 reactors have 12-finger CEAs, and the CPCS will trip the reactor due to their large reactivities when one of them is dropped at a high power. The ABB-CE reactor power cutback system has been proposed to be used against the 12-Finger CEA drop to avoid the reactor trips. The results of study show that the reactor power cutback can prevent the reactor trips of the 12-Finger CEA drop when the CPCS has enough operating thermal margin (more than 9% for YGN 3&4 Cycle 1). It is noted, however, that the probability of a 12-Finger CEA drop is very low, less than one per 100 reactor years for YGN 3& and System 80
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